Gravity chamber for a habitation module that rotates on support bearings

ABSTRACT

A habitation module with a gravity chamber that provides an artificial gravity environment. In one embodiment, the gravity chamber is annular and includes an outer cylindrical wall, an inner cylindrical structure, and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure. The gravity chamber attaches to a cylindrical core member of the habitation module with support bearings. The support bearing includes an inner race attached to the cylindrical core member, and an outer race attached to the gravity chamber. A drive mechanism drives the outer race of the support bearing to rotate the gravity chamber about an axis to simulate a gravitational force within the gravity chamber.

FIELD

This disclosure relates to the field of habitation modules that provide artificial gravity environments.

BACKGROUND

When humans occupy a space station, they encounter a zero-gravity environment or “weightless” environment. Extended exposure to a zero-gravity environment can be detrimental to the health of the human occupants, such as muscle and bone degeneration. To avoid these long-term health effects, artificial gravity environments may be installed in the space station. One way to create artificial gravity is with centrifugal force, where a vessel rotates at a speed that drives a human occupant inside of the vessel toward the outer hull of the vessel. The force on the human occupant feels like a gravitational pull.

Because of the health benefits and comfort of artificial gravity, it is desirable to design improved artificial gravity environments for space habitats/vehicles.

SUMMARY

Embodiments described herein include a habitation module for a space station or the like that includes a gravity chamber for human occupancy. The gravity chamber is annular with an outer cylindrical wall, an inner cylindrical structure, and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure. A cylindrical core member of the habitation module passes through an axial hole of the inner cylindrical structure, and the gravity chamber attaches to the cylindrical core member via support bearings. Each support bearing includes an inner race attached to the cylindrical core member, and an outer race attached to the gravity chamber. A drive mechanism rotates the gravity chamber on the support bearings about an axis to simulate a gravitational force within the gravity chamber. Artificial gravity is therefore created within the gravity chamber.

In one embodiment, the drive mechanism directly drives one or both of the support bearings. For instance, the outer race of a support bearing may include teeth that mesh with a drive gear of the drive mechanism. Therefore, the drive mechanism is able to directly drive the gravity chamber (i.e., rotate the gravity chamber about the axis) without direct contact with the inner cylindrical structure (or inner cylindrical wall) or the outer cylindrical wall. Thus, the drive mechanism will create very little noise within the gravity chamber.

A gravity chamber as described herein may be used as a walking, jogging, or running track, where crew members are able to exercise in an artificial gravity environment. An exercise track with artificial gravity is an improvement over treadmills and the like that are presently used in zero-gravity environments. Also, exercise in artificial gravity as compared to zero-gravity provides health benefits for the crew members, such as reduced muscle and bone degeneration.

A gravity chamber may be used for or reconfigured into resting areas, such as a restroom, bedroom, office, etc. Using a gravity chamber in this manner has benefits for the crew members, such as sleeping in a horizontal position, sitting in normal postures for work, etc.

One embodiment comprises a habitation module that includes a gravity chamber that is annular and includes an inner cylindrical structure that encircles a cylindrical core member of the habitation module, an outer cylindrical wall, and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure. The habitation module further includes first support bearings for attaching the gravity chamber to the cylindrical core member. Each of the first support bearings includes an inner race attached to the cylindrical core member, and an outer race attached to the gravity chamber. The habitation module further includes a first drive mechanism that drives the outer race of at least one of the first support bearings to rotate the gravity chamber in a first direction about an axis to simulate a gravitational force within the gravity chamber.

In another embodiment, the first support bearings comprise a pair of support bearings spaced axially along the cylindrical core member, and attached to opposing sides of the gravity chamber.

In another embodiment, the habitation module further includes a cylindrical counter-weight member that rotates about the axis in an opposite direction than the gravity chamber.

In another embodiment, the cylindrical counter-weight member comprises a counter-weight and second support bearings for attaching the counter-weight to the cylindrical core member. Each of the second support bearings includes an inner race attached to the cylindrical core member, and an outer race attached to the counter-weight.

In another embodiment, the habitation module further includes a second drive mechanism that drives the outer race of at least one of the second support bearings to rotate the counter-weight in a second direction about the axis that is opposite than the first direction.

In another embodiment, a first one of the first support bearings includes teeth on the outer race. The first drive mechanism includes a drive gear having teeth that mesh with the teeth on the outer race of the first one of the first support bearings. The first drive mechanism is configured to spin the drive gear to impart rotational movement to the outer race of the first one of the first support bearings.

In another embodiment, the gravity chamber is hollow between the inner cylindrical structure, the outer cylindrical wall, and the side walls, and an inner surface of the outer cylindrical wall is lined with a material for an exercise track.

In another embodiment, the gravity chamber includes a plurality of partitions that extend radially from the inner cylindrical structure to the outer cylindrical wall to define compartments within the gravity chamber, such as for a restroom facility, a sleeping facility, etc.

In another embodiment, the gravity chamber includes a divider orthogonal to the axis that divides the gravity chamber into a first annular sub-chamber and a second annular sub-chamber. The first annular sub-chamber is hollow between the inner cylindrical wall, the outer cylindrical wall, and the side walls for an exercise track. The second annular sub-chamber includes a plurality of partitions that extend radially from the inner cylindrical wall to the outer cylindrical wall between the side walls to define compartments within the second annular sub-chamber.

In another embodiment, the side walls include support members that extend from the inner cylindrical structure to the outer cylindrical wall. The support members include spring dampeners.

In another embodiment, the habitation module has a hull that defines an outer diameter of the habitation module, where the outer diameter of the hull is greater than a diameter of the outer cylindrical wall of the gravity chamber. The habitation module further includes a rib that protrudes from a periphery of the outer cylindrical wall of the gravity chamber, and linear bearings affixed to the hull on adjacent sides of the rib of the gravity chamber to contact the rib if the gravity chamber moves laterally.

Another embodiment comprises a habitation module that includes a first gravity chamber that is annular, where a cylindrical core member of the habitation module passes through a first axial hole of the first gravity chamber. The habitation module further includes a second gravity chamber that is annular, where the cylindrical core member of the habitation module passes through a second axial hole of the second gravity chamber. The habitation module further includes first support bearings for attaching the first gravity chamber to the cylindrical core member, where each of the first support bearings includes a first inner race attached to the cylindrical core member, and a first outer race attached to the first gravity chamber. The habitation module further includes second support bearings for attaching the second gravity chamber to the cylindrical core member, where each of the second support bearings includes a second inner race attached to the cylindrical core member, and a second outer race attached to the second gravity chamber. The habitation module further includes at least one drive mechanism that rotates the first gravity chamber on the first support bearings in a first direction about an axis, and rotates the second gravity chamber on the second support bearings in a second direction about the axis that is opposite the first direction.

Another embodiment comprises a habitation module having a hull that defines an outer diameter of the habitation module, and having a cylindrical core member encapsulated by the hull that extends through a center of the habitation module. The habitation module further includes an annular gravity chamber that includes an outer cylindrical wall, an inner cylindrical structure, and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure, where the inner cylindrical structure encircles the cylindrical core member. The habitation module further includes first support bearings for attaching the gravity chamber to the cylindrical core member, where each of the first support bearings includes a first inner race attached to the cylindrical core member, and a first outer race attached to the gravity chamber. The habitation module further includes a first drive mechanism that drives the first outer race of at least one of the first support bearings to rotate the gravity chamber in a first direction about an axis to simulate a gravitational force within the gravity chamber. The habitation module further includes a counter-weight and second support bearings for attaching the counter-weight to the cylindrical core member. Each of the second support bearings includes a second inner race attached to the cylindrical core member, and a second outer race attached to the counter-weight. The habitation module further includes a second drive mechanism that drives the second outer race of at least one of the second support bearings to rotate the counter-weight in a second direction about the axis that is opposite than the first direction.

The features, functions, and advantages that have been discussed can be achieved independently in various embodiments or may be combined in yet other embodiments, further details of which can be seen with reference to the following description and drawings.

DESCRIPTION OF THE DRAWINGS

Some embodiments of the present invention are now described, by way of example only, with reference to the accompanying drawings. The same reference number represents the same element or the same type of element on all drawings.

FIG. 1 illustrates a habitation module in an exemplary embodiment.

FIG. 2 illustrates a gravity chamber of a habitation module in an exemplary embodiment.

FIGS. 3A-3B illustrate support bearings in an exemplary embodiment.

FIG. 4 illustrates a gravity chamber attached to a cylindrical core member of a habitation module with support bearings in an exemplary embodiment.

FIG. 5 illustrates attachment of a gravity chamber to a cylindrical core member in an exemplary embodiment.

FIG. 6 illustrates a counter-weight member attached to a cylindrical core member of a habitation module with support bearings in an exemplary embodiment.

FIG. 7 illustrates attachment of a gravity chamber and a counter-weight member to a cylindrical core member in an exemplary embodiment.

FIG. 8 illustrates a pair of gravity chambers rotating in opposition in an exemplary embodiment.

FIG. 9 is a side view of a gravity chamber in an exemplary embodiment.

FIG. 10 illustrates an interior of a gravity chamber in an exemplary embodiment.

FIG. 11 illustrates an interior of a gravity chamber in an exemplary embodiment.

FIG. 12 illustrates a gravity chamber split into two or more annular sub-chambers in an exemplary embodiment.

FIG. 13 illustrates a peripheral support unit for a gravity chamber in an exemplary embodiment.

DETAILED DESCRIPTION

The figures and the following description illustrate specific exemplary embodiments. It will be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles described herein and are included within the contemplated scope of the claims that follow this description. Furthermore, any examples described herein are intended to aid in understanding the principles of the disclosure, and are to be construed as being without limitation. As a result, this disclosure is not limited to the specific embodiments or examples described below, but by the claims and their equivalents.

FIG. 1 illustrates a habitation module 100 in an exemplary embodiment.

Habitation module (HAB) 100 is a module used for living quarters for crew members of a space station, such as the International Space Station. For example, HAB 100 may be used for sleeping quarters, restroom facilities, medical facilities, exercise facilities, etc. HAB 100 is configured for space vehicles in Low-Earth Orbit (LEO) or Beyond Low-Earth Orbit (BLEO).

HAB 100 is illustrated as a cylindrical capsule with a hull 102 that encapsulates the modules and systems of HAB 100. Hull 102 is the rigid outer body or fuselage of HAB 100 that defines its outer diameter, which may be about 8.4 meters. The outer diameter of HAB 100 may be limited by the size of the launch vehicle used to transport HAB 100 into space. For example, a Space Launch System (SLS) from NASA may be used to transport HAB 100 into space, and the outer diameter of HAB 100 may be constrained by the size of the SLS. Although not shown in FIG. 1, at least a portion of the interior of hull 102 may be pressurized and supplied with oxygen. Either (or both) of the ends 104-105 of hull 102 may be attached to other modules of a space station. The structure of HAB 100 also includes a cylindrical core member 106 that extends through a center of HAB 100. The diameter of cylindrical core member 106 may be about 4.3 meters.

In order to provide an artificial gravity environment for the crew members, HAB 100 is equipped with one or more gravity chambers 110 that rotate about an axis 130. Gravity chamber 110 rotates at a speed to create an artificial gravity environment by simulating gravitational forces. For example, gravity chamber 110 may rotate at 8 rpm, 10 rpm, 12 rpm, etc., to create an artificial gravity environment. Gravity chamber 110 attaches to cylindrical core member 106 by attachment members 112, which allow gravity chamber 110 to rotate in relation to cylindrical core member 106. As will be described in more detail below, HAB 100 may further include a counter-weight member 150 that rotates in the opposite direction as gravity chamber 110.

FIG. 2 illustrates gravity chamber 110 of HAB 100 in an exemplary embodiment. Gravity chamber 110 is annular or ring-shaped, and has an outer cylindrical wall 210 that defines the outer diameter of gravity chamber 110, an inner cylindrical structure 212 that defines an inner diameter of gravity chamber 110, and opposing side walls 214-215. Outer cylindrical wall 210 is the outermost cylindrical surface of gravity chamber 110. Outer cylindrical wall 210 may be made from a thin metal, a composite material, a plastic, or another type of rigid material. Inner cylindrical structure 212 is the structure for attaching gravity chamber 110 to cylindrical core member 106 of HAB 100 (see FIG. 1). Inner cylindrical structure 212 may comprise a cylindrical wall made from a material, such as a thin metal, a composite material, a plastic, or another type of rigid material. Inner cylindrical structure 212 may additionally or alternatively comprise a frame with surfaces, ribs, support members, etc., for attaching gravity chamber 110 to cylindrical core member 106. Due to its cylindrical shape, inner cylindrical structure 212 has an axial hole 218 through its center that fits over cylindrical core member 106 of HAB 100. The diameter of axial hole 218 is larger than the diameter of cylindrical core member 106 so that cylindrical core member 106 is able to pass through axial hole 218. As an example, the diameter of cylindrical core member 106 may be about 4.3 meters, so the diameter of axial hole 218 would be greater than 4.3 meters in this example.

Side walls 214-215 each include a plurality of support members 230 that extend between outer cylindrical wall 210 and inner cylindrical structure 212. Support members 230 provide a rigid frame for side walls 214-215. Support members 230 may be made from aluminum, a composite material, or another type of material. For example, support members 230 may comprise 1 inch aluminum tubes with 0.049 inch walls. Support members 230 may extend radially from inner cylindrical structure 212 to outer cylindrical wall 210 as illustrated in FIG. 2, or may be angled in relation to the radial direction if desired. The number and placement of support members 230 is just an example, and may vary as desired. Side walls 214-215 may also include side closures 236 that enclose the area between support members 230. Side closures 236 may be made from a soft material, such as Kevlar®, canvas, or another type of fabric. One or more entry openings 238 may be formed in side closures 236 to allow crew members to access the inside of gravity chamber 110. Entry openings 238 have a size large enough for a crew member to pass through, and may include a door and a mechanism for opening and closing the door, such as a latch, a zipper, etc.

Gravity chamber 110 attaches to cylindrical core member 106 with attachment members 112, which may comprise support bearings. FIGS. 3A-3B illustrate support bearings 302-303 for gravity chamber 110 in an exemplary embodiment. Support bearings 302-303 are configured to attach gravity chamber 110 to cylindrical core member 106 so that gravity chamber 110 is able to rotate in relation to cylindrical core member 106 about axis 130. Support bearing 302 includes an inner race (or ring) 310, an outer race (or ring) 311, and a rolling element between inner race 310 and outer race 311 that enables rotational movement (not visible in FIG. 3A). The rolling element may comprise ball bearings, cylindrical rollers, or the like. Inner race 310 is configured to attach to cylindrical core member 106, while outer race 311 is configured to attach to gravity chamber 110. Support bearing 302 also includes a plurality of teeth 314 on outer race 311 for meshing with a drive gear of a drive mechanism. Support bearing 303 (see FIG. 3B) has a similar structure as support bearing 302 with an inner race 320 and an outer race 321, except that its outer race 321 does not include teeth.

FIG. 4 illustrates gravity chamber 110 attached to cylindrical core member 106 with support bearings 302-303 in an exemplary embodiment. Support bearings 302-303 are spaced axially along and attach to cylindrical core member 106. The use and placement of support bearings 302-303 as shown in FIG. 4 is just an example and may vary as desired. For example, two support bearings 302 with teeth 314 may be used in one application. In another example, more than two support bearings 302-303 may be used.

Cylindrical core member 106 includes mounting members 402 that protrude from an outer surface 410 of cylindrical core member 106. Mounting members 402 may comprise a ring that encircles cylindrical core member 106, or may comprise a plurality of individual members that are affixed around the circumference of outer surface 410. Support bearings 302-303 attach to mounting members 402, and also attach to gravity chamber 110.

FIG. 5 illustrates attachment of gravity chamber 110 to cylindrical core member 106 in an exemplary embodiment. FIG. 5 is a cross-section along line 5-5 of FIG. 4 showing attachment points of support bearings 302-303 to gravity chamber 110 (only a portion of gravity chamber 110 is shown in FIG. 5). On the left-hand side of gravity chamber 110, outer race 311 of support bearing 302 attaches to gravity chamber 110 with an attachment member 502, such as a bolt, screw, pin, etc. Outer race 311 may attach to inner cylindrical structure 212 or a side wall 214-215 of gravity chamber 110. Inner race 310 of support bearing 302 attaches to mounting member 402 with an attachment member 502. Bushings 504 (e.g., rubber bushings) may be used at the attachment point for outer race 311 and inner race 310 to absorb noise and/or vibration at the attachment point. Also shown in FIG. 5 is a rolling element 510 between inner race 310 and outer race 311 that enables rotational movement. Rolling element 510 may comprise ball bearings, cylindrical rollers, or the like.

A drive mechanism 520 is placed proximate or adjacent to outer race 311 of support bearing 302 to directly drive support bearing 302. Drive mechanism 520 is configured to spin a drive gear 522 to impart rotational movement to outer race 311. Teeth 524 on drive gear 522 mesh with teeth 314 on outer race 311 (see FIG. 3A). When drive mechanism 520 turns drive gear 522, it imparts rotational movement on gravity chamber 110 about axis 130 (see FIG. 1). Drive mechanism 520 may comprise an electric motor, a hydraulic motor, a pneumatic motor, or any other actuating device that has a variable rotational speed.

On the right-hand side of gravity chamber 110, outer race 321 of support bearing 303 attaches to gravity chamber 110 with an attachment member 502. Inner race 320 of support bearing 303 attaches to mounting member 402 with an attachment member 502. Bushings 504 may be used at the attachment point for outer race 321 and inner race 320 to absorb noise and/or vibration at the attachment point.

As shown in FIG. 5, support bearing 302 (with teeth 314) is installed on one side of gravity chamber 110, and support bearing 303 (without teeth 314) is installed on the other side of gravity chamber 110. In another embodiment, support bearing 302 (with teeth 314) may be installed on either side or both sides of gravity chamber 110. If support bearing 302 is installed on both sides, a drive mechanism will be installed on both sides of gravity chamber 110 to drive the outer race 311 of support bearing 302 from each side of gravity chamber 110.

The rotation of gravity chamber 110 about axis 130 creates a centrifugal force on objects (e.g., crew members) inside of gravity chamber 110 that pulls the objects towards outer cylindrical wall 210. The centrifugal force feels like gravity to a crew member inside of gravity chamber 110. Because gravity chamber 110 is attached to cylindrical core member 106 through support bearings 302-303, gravity chamber 110 will rotate very smoothly. Also, drive mechanism 520 drives support bearing 302 and does not directly contact the bottom of inner cylindrical structure 212, which results in minimal noise from drive mechanism 520.

The rotation of gravity chamber 110 may also create an unwanted momentum for HAB 100. To cancel out the unwanted momentum, cylindrical counter-weight member 150 (see FIG. 1) may be installed on cylindrical core member 106 to rotate about axis 130 in an opposite direction than gravity chamber 110. The structure of counter-weight member 150 may vary as desired. In one embodiment, a counter-weight may be installed on support bearings as described below.

FIG. 6 illustrates counter-weight member 150 attached to cylindrical core member 106 with support bearings in an exemplary embodiment. Counter-weight member 150 includes a counter-weight 620 attached to cylindrical core member 106 with support bearings 302-303. Counter-weight 620 comprises any mass that is able to be rotated around cylindrical core member 106. In the embodiment shown in FIG. 6, counter-weight 620 is a ring having a diameter greater than the diameter of cylindrical core member 106. Counter-weight 620 does not have to be a continuous structure as shown in FIG. 6, but may be segmented and spaced around the circumference of cylindrical core member 106. Counter-weight 620 is driven to rotate in the opposite direction of gravity chamber 110 to negate momentum created by rotation of gravity chamber 110. Momentum is measured in mass multiplied by velocity (rotational). If it is assumed that the mass of counter-weight 620 is fixed, the counter-weight 620 is driven at a speed to compensate for the momentum created by rotation of gravity chamber 110. If the mass of gravity chamber 110 changes (e.g., a crew member enters gravity chamber 110), then the rotational speed of counter-weight 620 may be adjusted to compensate for the change in mass. The rotational speed of counter-weight 620 is therefore adjusted so that there is a net-zero momentum change due to rotation of gravity chamber 110.

FIG. 7 illustrates attachment of gravity chamber 110 and counter-weight member 150 to cylindrical core member 106 in an exemplary embodiment. FIG. 7 is a cross-section along line 7-7 of FIG. 6. The attachment of gravity chamber 110 was described in relation to FIG. 5. On the left-hand side of counter-weight member 150, outer race 321 of support bearing 303 attaches to counter-weight 620 with an attachment member 502. Inner race 320 of support bearing 303 attaches to mounting member 402 with an attachment member 502. Bushings 504 may be used at the attachment point for outer race 321 and inner race 320 to absorb noise and/or vibration at the attachment point.

On the right-hand side of counter-weight member 150, outer race 311 of support bearing 302 attaches to counter-weight 620 with an attachment member 502. Inner race 310 of support bearing 302 attaches to mounting member 402 with an attachment member 502. Bushings 504 may be used at the attachment point for outer race 311 and inner race 310 to absorb noise and/or vibration at the attachment point. A drive mechanism 720 is placed proximate or adjacent to outer race 311 of support bearing 302 to directly drive the support bearing 302 for counter-weight 620. Drive mechanism 720 is configured to spin a drive gear 722 to impart rotational movement to outer race 311. Teeth 724 on drive gear 722 mesh with teeth 314 on outer race 311 (see FIG. 3A). When drive mechanism 720 turns drive gear 522, it imparts rotational movement on counter-weight 620 about axis 130 (see FIG. 1). Drive mechanism 720 drives counter-weight 620 in an opposite direction as gravity chamber 110, and is able to adjust the speed of rotation of counter-weight to cancel any momentum created by rotation of gravity chamber 110.

In another embodiment, counter-weight member 150 as shown in FIG. 1 may comprise a second gravity chamber that rotates in an opposite direction as gravity chamber 110. FIG. 8 illustrates a pair of gravity chambers rotating in opposition in an exemplary embodiment. In this embodiment, HAB 100 includes gravity chamber 110 as described above, and includes a second gravity chamber 810. The structure of gravity chamber 810 may be the same or similar as that described above, and may attach to cylindrical core member 106 in a similar manner through support bearings. For example, gravity chamber 810 may attach to cylindrical core member 106 in a similar manner as shown in FIG. 5 with support bearings 302-303, and a drive mechanism 520 (a shared or independent drive mechanism). Gravity chamber 810 is driven to rotate in a direction opposite of gravity chamber 110. Therefore, gravity chamber 810 may be used to cancel any momentum created from rotation of gravity chamber 110 (or vice-versa). The corresponding drive mechanisms for gravity chambers 110 and 810 are able to adjust the speed of rotation of gravity chambers 110 and 810 to create a net-zero momentum change on HAB 100. If independent drive mechanisms are used for gravity chambers 110 and 810, then the speed of the drive mechanism may be independently controlled. If a shared drive mechanism is used, then a gear box may be used to control the speed of gravity chambers 110 and 810 independently.

FIG. 9 is a side view of gravity chamber 110 in an exemplary embodiment. The view in FIG. 9 is of side wall 215. In this embodiment, support members 230 include spring dampeners 904 that are configured to dampen noise and vibration effects of activities inside of gravity chamber 110, such as exercise activities.

FIG. 10 illustrates an interior of gravity chamber 110 in an exemplary embodiment. FIG. 10 is a cross-section along line 10-10 of FIG. 9. In this embodiment, gravity chamber 110 is used for exercise activities, and therefore, may be referred to as an exercise chamber. Its interior is hollow or empty between inner cylindrical structure 212, outer cylindrical wall 210, and side walls 214-215 so that a crew member 1004 is able to walk, jog, or run within gravity chamber 110. An inner surface 1002 of outer cylindrical wall 210 may be lined with a synthetic rubber material or similar type of material for an exercise track. Thus, crew member 1004 walks, jogs, or runs on inner surface 1002 as gravity chamber 110 rotates to create an artificial gravity environment.

FIG. 11 illustrates an interior of gravity chamber 110 in another exemplary embodiment. FIG. 11 is also a cross-section along line 10-10 of FIG. 9. In this embodiment, gravity chamber 110 is compartmentalized into individual rooms. As the rooms of gravity chamber 110 may be used for rest and other activities, gravity chamber 110 may be referred to as a Rest and Activities (RAC) chamber in this embodiment. Gravity chamber 110 includes a plurality of partitions 1102 that extend radially from inner cylindrical structure 212 to outer cylindrical wall 210 to define the compartments 1104 within gravity chamber 110. Partitions 1102 may extend fully from inner cylindrical structure 212 to outer cylindrical wall 210, and from side wall 214 to side wall 215 to completely enclose compartments 1104 for privacy. Compartments 1104 may be used for a variety of purposes, such as restroom facilities 1109 having a shower 1110, a toilet 1112, and a sink 1114. A compartment 1104 may be used for office facilities 1120 having a desk 1122, chairs, cabinets, etc. A compartment 1104 may be used for lounge facilities 1124 having chairs 1126, a couch, etc. A compartment 1104 may also be used for sleeping facilities 1128 having a bed 1130.

FIG. 12 illustrates gravity chamber 110 split into two or more annular sub-chambers in an exemplary embodiment. In FIG. 12, gravity chamber 110 includes a divider 1202 that is orthogonal to axis 130, and divides gravity chamber 110 into annular sub-chambers 1210-1211. Sub-chamber 1210 is an exercise chamber such as shown in FIG. 10, and therefore, is hollow between inner cylindrical structure 212 and outer cylindrical wall 210. Sub-chamber 1211 is a RAC chamber, and includes a plurality of partitions that extend radially from inner cylindrical structure 212 to outer cylindrical wall 210 to define compartments within annular section 1211, such as shown in FIG. 11. Crew members are able to pass through divider 1202, such as through access openings, so that they can move freely between the RAC chamber and the exercise chamber.

As gravity chamber 110 rotates in the above embodiments, it may shift laterally or lean due to uneven weight distribution, movement of crew members within gravity chamber 110, etc. Therefore, a support unit may be installed on the periphery of gravity chamber 110 to restrict lateral movement. FIG. 13 illustrates a peripheral support unit 800 for gravity chamber 110 in an exemplary embodiment. FIG. 13 is a cross-section along line 13-13 of FIG. 1. Peripheral support unit 1300 is installed along the periphery of gravity chamber 110 to dampen lateral shifting of gravity chamber 110. Peripheral support unit 1300 includes a rib 1302 that protrudes from the periphery of outer cylindrical wall 210. Rib 1302 may be a continuous member that extends around the entire circumference of outer cylindrical wall 210. Rib 1302 may be rounded as shown in FIG. 13, or may be square, triangular, or have any desired shape. Peripheral support unit 1300 also includes linear bearings 1304 that are spaced around an inner surface 1320 of hull 102 (see also FIG. 1). Linear bearings 1304 are affixed to inner surface 1320 of hull 102 adjacent to the sides of rib 1302. For example, a pair of linear bearings 1304 may be affixed to inner surface 1320 of hull 102 on either side of rib 1302 as shown in FIG. 13. If gravity chamber 110 shifts laterally, then rib 1302 will contact one or more rolling elements 1306 (e.g., a ball bearing) in one of linear bearings 1304. Because of the positioning of linear bearings 1304 in relation to rib 1302, gravity chamber 110 will only be able to laterally shift a certain amount.

Although specific embodiments were described herein, the scope is not limited to those specific embodiments. Rather, the scope is defined by the following claims and any equivalents thereof. 

1. A habitation module comprising: a gravity chamber that is annular and includes: an inner cylindrical structure that encircles a cylindrical core member of the habitation module; an outer cylindrical wall; and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure; first support bearings for attaching the gravity chamber to the cylindrical core member, wherein each of the first support bearings includes an inner race attached to the cylindrical core member, and an outer race attached to the gravity chamber; and a first drive mechanism that drives the outer race of at least one of the first support bearings to rotate the gravity chamber in a first direction about an axis to simulate a gravitational force within the gravity chamber.
 2. The habitation module of claim 1 wherein the first support bearings comprise: a pair of support bearings spaced axially along the cylindrical core member, and attached to opposing sides of the gravity chamber.
 3. The habitation module of claim 1 further comprising: a cylindrical counter-weight member that rotates about the axis in an opposite direction than the gravity chamber.
 4. The habitation module of claim 3 wherein the cylindrical counter-weight member comprises: a counter-weight; and second support bearings for attaching the counter-weight to the cylindrical core member, wherein each of the second support bearings includes an inner race attached to the cylindrical core member, and an outer race attached to the counter-weight.
 5. The habitation module of claim 4 further comprising: a second drive mechanism that drives the outer race of at least one of the second support bearings to rotate the counter-weight in a second direction about the axis that is opposite than the first direction.
 6. The habitation module of claim 1 wherein: a first one of the first support bearings includes teeth on the outer race; the first drive mechanism includes a drive gear having teeth that mesh with the teeth on the outer race of the first one of the first support bearings; and the first drive mechanism is configured to spin the drive gear to impart rotational movement to the outer race of the first one of the first support bearings.
 7. The habitation module of claim 1 wherein: the gravity chamber is hollow between the inner cylindrical structure, the outer cylindrical wall, and the side walls; and an inner surface of the outer cylindrical wall is lined with a material for an exercise track.
 8. The habitation module of claim 1 wherein: the gravity chamber includes a plurality of partitions that extend radially from the inner cylindrical structure to the outer cylindrical wall to define compartments within the gravity chamber.
 9. The habitation module of claim 8 wherein: at least one of the compartments is for a restroom facility.
 10. The habitation module of claim 8 wherein: at least one of the compartments is for a sleeping facility.
 11. The habitation module of claim 1 wherein: the gravity chamber includes a divider orthogonal to the axis that divides the gravity chamber into a first annular sub-chamber and a second annular sub-chamber; the first annular sub-chamber is hollow between the inner cylindrical wall, the outer cylindrical wall, and the side walls for an exercise track; and the second annular sub-chamber includes a plurality of partitions that extend radially from the inner cylindrical wall to the outer cylindrical wall between the side walls to define compartments within the second annular sub-chamber.
 12. The habitation module of claim 1 wherein: the side walls include support members that extend from the inner cylindrical structure to the outer cylindrical wall; and the support members include spring dampeners.
 13. The habitation module of claim 1 further comprising: a hull that defines an outer diameter of the habitation module, wherein the outer diameter of the hull is greater than a diameter of the outer cylindrical wall of the gravity chamber; a rib that protrudes from a periphery of the outer cylindrical wall of the gravity chamber; and linear bearings affixed to the hull on adjacent sides of the rib of the gravity chamber to contact the rib if the gravity chamber moves laterally.
 14. A habitation module comprising: a first gravity chamber that is annular, wherein a cylindrical core member of the habitation module passes through a first axial hole of the first gravity chamber; a second gravity chamber that is annular, wherein the cylindrical core member of the habitation module passes through a second axial hole of the second gravity chamber; first support bearings for attaching the first gravity chamber to the cylindrical core member, wherein each of the first support bearings includes a first inner race attached to the cylindrical core member, and a first outer race attached to the first gravity chamber; second support bearings for attaching the second gravity chamber to the cylindrical core member, wherein each of the second support bearings includes a second inner race attached to the cylindrical core member, and a second outer race attached to the second gravity chamber; and at least one drive mechanism that rotates the first gravity chamber on the first support bearings in a first direction about an axis, and rotates the second gravity chamber on the second support bearings in a second direction about the axis that is opposite the first direction.
 15. An apparatus comprising: a habitation module having a hull that defines an outer diameter of the habitation module, and having a cylindrical core member encapsulated by the hull that extends through a center of the habitation module; an annular gravity chamber that includes an outer cylindrical wall, an inner cylindrical structure, and opposing side walls that connect the outer cylindrical wall and the inner cylindrical structure, wherein the inner cylindrical structure encircles the cylindrical core member; first support bearings for attaching the gravity chamber to the cylindrical core member, wherein each of the first support bearings includes a first inner race attached to the cylindrical core member, and a first outer race attached to the gravity chamber; a first drive mechanism that drives the first outer race of at least one of the first support bearings to rotate the gravity chamber in a first direction about an axis to simulate a gravitational force within the gravity chamber; a counter-weight; second support bearings for attaching the counter-weight to the cylindrical core member, wherein each of the second support bearings includes a second inner race attached to the cylindrical core member, and a second outer race attached to the counter-weight; and a second drive mechanism that drives the second outer race of at least one of the second support bearings to rotate the counter-weight in a second direction about the axis that is opposite than the first direction.
 16. The apparatus of claim 15 wherein: a first one of the first support bearings includes teeth on the first outer race; the first drive mechanism includes a drive gear having teeth that mesh with the teeth on the first outer race of the first one of the first support bearings; and the first drive mechanism is configured to spin the drive gear to impart rotational movement to the first outer race of the first one of the first support bearings.
 17. The apparatus of claim 15 wherein: the gravity chamber is hollow between the inner cylindrical structure, the outer cylindrical wall, and the side walls; and an inner surface of the outer cylindrical wall is lined with a material for an exercise track.
 18. The apparatus of claim 15 wherein: the gravity chamber includes a plurality of partitions that extend radially from the inner cylindrical structure to the outer cylindrical wall to define compartments within the gravity chamber.
 19. The apparatus of claim 15 wherein: the side walls include support members that extend from the inner cylindrical structure to the outer cylindrical wall; and the support members include spring dampeners.
 20. The apparatus of claim 15 wherein: the second drive mechanism adjusts a rotational speed of the counter-weight to compensate for a change in mass of the gravity chamber.
 21. The apparatus of claim 15 wherein: the gravity chamber includes a divider orthogonal to the axis that divides the gravity chamber into a first annular sub-chamber and a second annular sub-chamber; the first annular sub-chamber is hollow between the inner cylindrical wall, the outer cylindrical wall, and the side walls for an exercise track; and the second annular sub-chamber includes a plurality of partitions that extend radially from the inner cylindrical wall to the outer cylindrical wall between the side walls to define compartments within the second annular sub-chamber. 